Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.stsci.edu/jwst/doc-archive/presentations/JWST-STScI-000438.pdf Äàòà èçìåíåíèÿ: Unknown Äàòà èíäåêñèðîâàíèÿ: Tue Feb 5 12:06:19 2013 Êîäèðîâêà: Ïîèñêîâûå ñëîâà: m 27

The Mid-Infrared Instrument (MIRI) for JWST
· MIRI is a NASA/JPL-led partnership with a European Consortium sponsored by ESA
­ NASA provides focal planes, signal chain ­ Consortium provides optical bench assembly

·

Functional capabilities include ­ Imaging · =5-27 µm wavelength range · Diffraction limited imaging with 0.1" pixels · ~2 square arcmin field of view · Low resolution spectrograph (R~100; =5-10 µm) for single, compact sources · Coronagraph ­ Spectroscopy · =5-27 µm wavelength range, goal to reach = 28.3 µm · Integral field spectroscopy with fields of view of 3" or more · R~3000 - 1000 from =5-27 µm

Science team

G. Rieke (lead), G. Wright (co-lead), F. Bortoletto*, T. Greene, T. Henning*, P.-O. Lagage*, M. Meixner, & E. Serabyn (inst.scientist) (+ B. Rauscher & E. van Dishoeck) *acting


"Having NGST's sensitivity extend to 27µm would add significantly to its scientific return." .. "NGST would gain its greatest advantage over any ground-based telescope at the longer infrared wavelengths." ­ Astronomy and Astrophysics in the New Millenium (McKee-Taylor decadal survey)
1. E +08 1. E +07 Relative Mapping Time 1. E +06 1. E +05 1. E +04 1. E +03 1. E +02 1. E +01 1. E +00 0 5 10 15 20 25 W avel en g th (m icro n s)

8-m SIRT F 30-m JW S T


"NGST will cover the spectrum out to wavelengths of at least 5µm ...extending the sensitivity of NGST farther into the thermal infrared would greatly increase its ability to study galaxies at high redshifts." ­ Astronomy and Astrophysics in the New Millenium
100 1.00E+06

Flux (Jy), arbitrary norm.

All three objects at z = 15.

first light: stars older galaxy quasar

NIRCam MIRI

10 1.00E+05

1 4

1.6 4.2

2.5 4.4

4 4.6

6.3 4.8

10 5

wavelength (microns)


"NGST will cover the spectrum out to wavelengths of at least 5µm ...extending the sensitivity of NGST farther into the thermal infrared would greatly increase its ability to study galaxies at high redshifts." ­ Astronomy and Astrophysics in the New Millenium
100 1.00E+06

Flux (Jy), arbitrary norm.

MIRI observations can distinguish a galaxy with an older stellar population
first light: stars older galaxy quasar

from a true first light object.
NIRCam MIRI

10 1.00E+05

1 4

1.6 4.2

2.5 4.4

4 4.6

6.3 4.8

10 5

wavelength (microns)


"NGST will cover the spectrum out to wavelengths of at least 5µm ...extending the sensitivity of NGST farther into the thermal infrared would greatly increase its ability to study galaxies at high redshifts." ­ Astronomy and Astrophysics in the New Millenium
100 1.00E+06

Flux (Jy), arbitrary norm.

MIRI observations can distinguish a galaxy with an older stellar population + AV ~ 0.4 first light: stars@ z = 3
older galaxy quasar

from a true first light object.
NIRCam MIRI

NIRCam B4-B6 1.6 1 4 4.2 within 0.2 magnitudes for all three objects.

10 1.00E+05

2.5 4.4

4 4.6

6.3 4.8

10 5

wavelength (microns)

MIRI observations become essential if there is a small amount of reddening due to foreground damped Ly systems.


"[to trace quasar evolution] to earlier epochs we will sensitivity detections in the near-to-mid-IR. The next surveys will begin with the Space Infrared Telescope and be carried to unprecedented depths by JWST."­
100 1.00E+06

require highgeneration of Facility (SIRTF) Origins Roadmap

Flux (Jy), arbitrary norm.

What were the properties of the first quasars, at z = 10 - 20?
first light: stars older galaxy quasar

NIRCam MIRI 10 1.00E+05
1 4 1.6 4.2 2.5 4.4 4 4.6 6.3 4.8 10 5

NIRCam and MIRI will be needed together to compare their properties with those at lower redshift.

wavelength (microns)


"JWST will be able to probe the most central regions of protostars." ­ Origins Roadmap

mm-wave & far infrared probe the accretion disks and extended envelopes actual protostars are accessible through their mid-infrared emission


"JWST will be able to probe the most central regions of protostars." ­ Origins Roadmap

H 2O


"JWST will be able to probe the most central regions of protostars." ­ Origins Roadmap


"The initial steps
toward planet formation occur in the surrounding disk of material that avoids either falling into a forming star or being ejected in outflows.... JWST will penetrate the obscuration to image these disks. " .. continuum and spectral line observations must be conducted at angular resolutions of 0.1 ­ 1.0 arcsec (10 ­ 100 astronomical units in the nearest star-forming regions)." --Origins Roadmap

MIRI beam @ 7µm CIRCUMSTELLAR DISK

DUSTY ENVELOPE PROTOSTAR

~ 500 AU

orbit of Pluto


"SIRTF will give us our first hints concerning gas and dust dispersal,

Debris Disks

(model of Vega system by Wilner et al. for submm)


"SIRTF will give us our first hints concerning gas and dust dispersal,

Debris Disks
but follow-on large space-based telescopes such as JWST and SAFIR are ideally suited to track the evolution and map the structure of vestigial debris disks around nearby main-sequence stars." ­ Origins Roadmap

(model of Vega system by Wilner et al. for submm)


"Our recommended large-aperture, IR-optimized space telescope will be essential for the detailed studies of the early universe at ~ 1 ­ 5µm. However, we also recommend that it be operated as a powerful general-purpose observatory, serving a broad range of scientific programs over the wavelength range ~ 0.5 ­ 20µm, the exact coverage to be determined on the basis of future technical evaluation." ­ HST and Beyond


"Our recommended large-aperture, IR-optimized space telescope will be essential for the detailed studies of the early universe at ~ 1 ­ 5µm. However, we also recommend that it be operated as a powerful general-purpose observatory, serving a broad range of scientific programs over the wavelength range ~ 0.5 ­ 20µm, the exact coverage to be determined on the basis of future technical evaluation." ­ HST and Beyond "the mid-infrared compatible concept...is the most advantageous solution for NGST. Such a solution is not significantly more costly and offers lower risk because of the possibility to passively cool the NIR detectors. This approach enables the mid-infrared, zodiacal light limited to 10µm, without increasing complexity, risk, or cost of the observatory." ­ BÈly et al.


"Our recommended large-aperture, IR-optimized space telescope will be essential for the detailed studies of the early universe at ~ 1 ­ 5µm. However, we also recommend that it be operated as a powerful general-purpose observatory, serving a broad range of scientific programs over the wavelength range ~ 0.5 ­ 20µm, the exact coverage to be determined on the basis of future technical evaluation." ­ HST and Beyond "the mid-infrared compatible concept...is the most advantageous solution for NGST. Such a solution is not significantly more costly and offers lower risk because of the possibility to passively cool the NIR detectors. This approach enables the mid-infrared, zodiacal light limited to 10µm, without increasing complexity, risk, or cost of the observatory." ­ BÈly et al. "JWST is expected to ... be celestial-background-limited between 0.6 and 10 micrometers, with imaging and spectroscopic instruments that will cover this entire wavelength regime." ­ Origins Roadmap


"Our recommended large-aperture, IR-optimized space telescope will be essential for the detailed studies of the early universe at ~ 1 ­ 5µm. However, we also recommend that it be operated as a powerful general-purpose observatory, serving a broad range of scientific programs over the wavelength range ~ 0.5 ­ 20µm, the exact coverage to be determined on the basis of future technical evaluation." ­ HST and Beyond "the mid-infrared compatible concept...is the most advantageous solution for NGST. Such a solution is not significantly more costly and offers lower risk because of the possibility to passively cool the NIR detectors. This approach enables the mid-infrared, zodiacal light limited to 10µm, without increasing complexity, risk, or cost of the observatory." ­ BÈly et al. "JWST is expected to ... be celestial-background-limited between 0.6 and 10 micrometers, with imaging and spectroscopic instruments that will cover this entire wavelength regime." ­ Origins Roadmap "Having NGST's sensitivity extend to 27µm would add significantly to its scientific return." ­ Astronomy and Astrophysics in the New Millenium